There are several cases where when I connect with my admin account to browse the Office 365 Resource Calendar, the attendance buttons are missing from time to time, and I have no clue why. These meetings are still valid and existing meetings in the organizer inbox, but from the Resource Calendar, the only option is "Delete".
See normal Resource Calendar meeting attendance option
vs. the missing attendance option and only the Delete option available
Anyone have seen same behavior and knows why it is happening ? Thanks!